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        // 三个取整方法
        // (1)Math.floor() floor 地板 向下取整 往最小了取值
        console.log(Math.floor(1.1));//1
        console.log(Math.floor(1.9));//1
        // (2)Math.ceil() ceil 天花板 向上取整 往最大了取值
        console.log(Math.ceil(1.1));//2
        console.log(Math.ceil(1.9));//2
        // (3)Math.round() 四舍五入 其他数字都是四舍五入，但是 .5 特殊 它往大了取
        console.log(Math.round(1.1));//1
        console.log(Math.round(1.5));//2
        console.log(Math.round(1.9));//2
        console.log(Math.round(-1.1));//-1
        console.log(Math.round(-1.5));//-1
    </script>
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